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Home Page. Circular Slide Rules. Pocket Watch Slide Rules. Cylindrical Slide Rules. Mechanical Calculators.


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K-5etc. The first letter is the year, as is listed in the following table. The second letter, restricted to either S or K is assumed to be the manufacturing location.

Today, Ricoh is known to have factories in the Shizuoka and Kanagawa prefectures, but at the time The significance of the number is unknown, the highest found in existing collections is 6. It could simply be a batch number. Dating a slide rule becomes difficult if a manufacturer did not imprinting a date code or serial number on the stock. Even then, some manufacturers recycled their serial numbers over time, and the stock could have been left on a shelf for a period of time before the slide rule was assembled and shipped.

Catalogs are an excellent indication of when a model was produced or discontinued. Sometimes the copyright date in a manual is used to determine the approximate age, but one printing could span several decades. Dates that a design was registered or patented only suggests an approximate year a model may have been first produced, as the model may have been distributed a year or more before issuance patent pending.

The patent may only refer to a certain combination of scales used over a thirty year time on different models. Having contact with the original owner of a slide rule that remembers the year it was purchased helps on determining the age.

Many of the founders of United States firms producing slide rules had their roots as employees in other firms, just as modern entrepenuers break off from their employers and create their own start-up companies. The downloadable charts are a matrix of Dietzgen slide rules, catalogs and price lists that was compliled by Bruce Babcock, Ph. Here are some excerpts written by Clark McCoy: Serial Numbers: Serial numbers started in beginning with 0 and going through then rolling over to 0 again.

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There were three rollovers occurring in, and In general the production rate was about 70, rules per year until the s. In the s and it was overper year. The s had a production rate of aboutper year for several years and tapering off in the s ending at about In general it is safe to assume a linear production rate between the rollover dates particularly for the common types rules. Post sold a wide variety of slide rules, both under its own name and under the names of various manufacturers.

Rules were marked "J. Hemmi" or "Tamaya" Hemmi's first retailer.

Nestler Slide Rules. The latest member of my little slide rule family, Nestler was another major German slide rule manufacturer. They had many similar offerings to Faber Castell, and their early celluloid-wood rules are actually quite difficult to tell apart. Like Faber and Aristo, they eventually switched to mainly all-plastic models, and. Similar slide rules have been produced by Hemmi (number ), Keuffel and Esser, Faber, Unique, ALRO (a disk, see picture), Aristo (a disk with number ) and Concise (number ). Slide rules with the same function were already made in the nineteenth century. At the back of my Nestler is a table of atomic masses. Dating events new york. Dating nestler slide rules. Recently i. One of other. Do you honor or mock the interesting questions with case. See more ideas about slide rule maker. This is the amount of several parameters. Hemmi slide rule outside of manufacturing. Faber castell have nos slide rules were manufactured predominantly in germany, slide.

As a result of a study made of materials, bamboo indigenous to Asia, was selected as the material, resulting in the granting of patents for a bamboo slide rule not only in Japan, but in England and France inand in the US, China, and Canada in Being the symbol of Japan itself, the image of the rising sun was thought to bode well for the future of the firm's business.

Initially used on metal-framed cursors; later on frameless. Models dissapear; model numbers above 20 introduced. Rules are marked just "Hemmi," no longer "J. Sadatoshi Betsumiya and Jisuke Miyazaki was applied to the Japan's first duplex slide rule, which was sold under the model name of Universal, this product winning wide acclaim. In December, capital was increased toyen, this to be increased further toyen in Jiro Hemmi was honored by receipt of a government award on the occasion of the th anniversary of the legendary ascension of the Emperor Jimmu to the throne.

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Slide rules are used in Japanese middle school textbooks for the first time. Standard duplex slide rules are redesigned as the new models,an aimed at the US market. The slide rule is again made a compulsory part of the curriculum in middle schools.

Kunz of Siber Hegner Co. The Chamber, with the backing of the Ministry of Education, holds its first open paper contest, inviting papers from middle school teachers on the theme of their methods of teaching the use of the slide rule. Improvements are made in both quality and production levels.

A proposed new two-story factory building, with environmental control reinforced concrete construction is built approximately square meters 15, square feet.

November, - R. Piehl, president of Frederick Post Co. Developmental History of the Slide Rule is published to mark this event.

Basic slide rule theory and use (Part 1): C and D scales

May, - O. July, - A.

Richardson Mr. Aub Richardsonsales manager of Hemmi's Australian representative, E. All of these organizations issued a publication called Slide Rule Education. March, - C. Rayner, president of Berrick Brothers Ltd. July, - Mrs. Esdaile of Hemmi's Australian representative, E. This slide rule uses a light green scale, a first in Japanese slide rules. January, - The Model P23 7-inch slide rule, a new style of slide rule for student use, is introduced, using plastic as a material for the first time.

PLEASE. My friend do not try to use money to get sex from women. There is a 37 year old man who has Dating Nestler Slide Rules a child, and describes himself as Dating Nestler Slide Rules an old fat balding ginger. He gets casual sex from many different attractive women on / Nostalgic original Keuffel and Esser slide rules with their advanced trigonometric and logarithmic scales invoke fond memories in accountants, engineers, scientists, and business consultants. Undergraduate and graduate college students majoring in math, science, or engineering who graduated prior to used this mechanical analog computer in. - Nestler OEM's slide rules from Uchida Yoko Co. Japan - Nestler stops selling slide rules after years due to the electronic calculator. Company concentrates on drafting equipment and CAD software on computers. - Company closes down.

January, - 18th issue of the weekly Yomiuri Shukan recommends bamboo slide rules made by Hemmi, classed as a top Japanese manufacturer, in a two-page article which describes the Shirako Factory. These are easily dated, at least for certain periods, because of family situations. Bozarth, forms Engineering Instruments, Inc. Chicago company managed by Mr. Name changes to Pickett Industries. August Slide rule manufacturing ends. Drafting supplies continue.

A large inventory of plastic Picketts left unsold.

Dating nestler slide rules

From to the Pickett design evolved to improve quality and to increase productivity. The stock, slide, cursor and logo all are clues to determining the manufacturing dates. This is usually a combination of alpha and numeric codes which defines the rule's factory of manufacture, year of manufacture and batch number. Code Details There are three code segments, The factory, year of manufacture and lot number. The lot number is self-explanatory.

Factory codes: 1st character, either alpha or numeric. Letter Code. The company is now called A.

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Faber" - the brand name is born. At some point the company grows to employess. Pickworth writes the English versions of A. Faber's slide rule manuals. Faber to A. Trademark still has a stylized balance scale marked A.

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Faber - Springy-stocks are introduced DRP to keep tension on the slide. Faber appears only on simple slide rules for beginners.

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Albert Nestler No This slide rule has no manufacturer's mark, however its box is marked Albert Nestler N and the rule does fit the box very well therefore despite the fact that Nestler Ns pictured elsewhere are of a different rule I am keeping this with my other Nestler Rules until it is proven not to be a Nestler or otherwise. Dating K&E Slide Rules. Dating a particular K&E slide rule can be a challenge. In most cases dating of a particular slide rule requires consideration of several parameters. Model numbers, serial numbers, catalog descriptions, cursor types, patent dates, variants, and specials are used in combination with each other to fully identify a given. Dating exclusivity the rules - Find single woman in the US with online dating. Looking for romance in all the wrong places? Now, try the right place. Men looking for a woman - Women looking for a man. Is the number one destination for online dating .

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